<template>
    <ContentBase v-if="!$store.state.user.pulling_info">
        <div class="row justify-content-md-center">
            <div class="col-3">
                <form @submit.prevent="login">
                    <div class="mb-3">
                        <label for="username" class="form-label">用户名</label>
                        <input v-model="username" type="text" class="form-control" id="username">
                    </div>
                    <div class="mb-3">
                        <label for="password" class="form-label">密码</label>
                        <input v-model="password" type="password" class="form-control" id="password">
                    </div>
                    <div class="error-message">{{ error_message }}</div>
                    <button type="submit" class="btn btn-primary">登录</button>
                </form>
            </div>
        </div>
    </ContentBase>
</template>

<script>
import ContentBase from '../components/ContentBase'
import { ref } from 'vue';
import { useStore } from 'vuex';
import router from '@/router/index';
import $ from 'jquery';

export default {
    name: 'LoginView',
    components: {
        ContentBase,
    },
    setup() {
        const store = useStore();
        let username = ref('');
        let password = ref('');
        let error_message = ref('');

        const jwt_token = localStorage.getItem("jwt_token");
        if (jwt_token) {
            $.ajax({
                url: "http://localhost:8081/myspace/account/info/",
                type: "GET",
                headers: {      // jwt验证写法
                    'Authorization': "Bearer " + jwt_token,
                },
                success(resp) {     
                    store.commit("updateUser", {
                        ...resp,    // 将resp解构
                        token: jwt_token,
                        is_login: true,
                    });
                    router.push({name: 'userlist'});
                    store.commit("updatePullingInfo", false);
                },
                error() {
                    store.commit("updatePullingInfo", false);
                }
            })
        } else {
            store.commit("updatePullingInfo", false);
        }

        const login = () => {
            error_message.value = "";   // 登录的时候将错误信息清空
            // dispatch用来调用user的actions里的变量（函数），将变量名作为第一个参数，第二个参数可以任意传
            store.dispatch("login", {
                username: username.value,
                password: password.value,
                success() {
                    router.push({name: 'userlist'});    // push的内容跟Navbar中跳转的内容一样
                },
                error() {
                    error_message.value = "用户名或密码错误";
                }
            });
        };

        return {
            username,
            password,
            error_message,
            login,
        }
    }
}
</script>

<style scoped>
button {
    width: 100%;
}

.error-message {
    color: red;
}
</style>